Erdős Memorial Lecture: The first 2013 Erdős Memorial Lecture will be held at this meeting on April 27, 2013 in Room 2055, Hoover Hall, 11:10 a.m.-12:00 p.m. The lecturer will be Endre Szemerédi, Rutgers University and Alfréd Rényi Institute of Mathematics in Hungary. He is also winner of the Abel Prize. The title of his talk will be On Subset Sums. Reception to follow in Howe Hall Lobby.